If it's only the outer most hinge, here's an easy fix:

Run a razor along the TE of the wing and the LE of the aileron to remove whatever hinge is in the gap. Then, make 3 hinges from covering (let us know if you are not familiar with hinged made from covering, and someone here will explain it). Replace the outer hinge with 3 covering hinges, and you'll be good as new.